cpanspec

#!/usr/bin/perl
#
# cpanspec - Generate a spec file for a CPAN module
#
# Copyright (C) 2004-2011 Steven Pritchard <steve@kspei.com>
# This program is free software; you can redistribute it
# and/or modify it under the same terms as Perl itself.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# $Id: cpanspec,v 1.68 2009/01/22 01:48:06 stevenpritchard Exp $

our $NAME="cpanspec";
our $VERSION='1.79';

=head1 NAME

cpanspec - Generate a spec file for a CPAN module

cpanget - Download a CPAN module

=head1 SYNOPSIS

cpanspec [options] [module [...]]

cpanget [options] [module [...]]

 Options:
   --help       -h      Help message
   --old        -o      Be more compatible with old RHL/FC releases
   --perl-version   -P  Minimum perl version to support
   --license    -l      Include generated license texts if absent in source
   --noprefix   -n      Don't add perl- prefix to package name
   --force      -f      Force overwriting existing spec
   --packager   -p      Name and email address of packager (for changelog)
   --release    -r      Release of package (defaults to 1)
   --epoch      -e      Epoch of package
   --disttag    -d      Disttag (defaults to %{?dist})
   --srpm       -s      Build a source rpm
   --build      -b      Build source and binary rpms
   --cpan       -c      CPAN mirror URL
   --verbose    -v      Be more verbose
   --prefer-macros  -m  Prefer macros over environment variables in the spec
   --download-only  -D  Only download the tarball from CPAN

 Long options:
   --follow             Process build dependencies
   --filter-requires    Specify Requires to remove
   --filter-provides    Specify Provides to remove
   --add-requires       Add Requires for this item
   --add-provides       Add Provides for this item
   --add-buildrequires  Add BuildRequires for this item
   --version            Print the version number and exit

The modules specified on the command line can be either filenames of tarballs,
or module names as downloadable from CPAN.

=head1 EXAMPLES

cpanspec Linux::Prctl

cpanspec ~/downloads/Acme-MetaSyntactic-0.99.tar.gz

cpanget Module::Build

=head1 DESCRIPTION

B<cpanspec> will generate a spec file to build a rpm from a CPAN-style
Perl module distribution.

B<cpanget> will download the tarball for a module from CPAN. This
implies --download-only and ignores most other options.

=head1 OPTIONS

=over 4

=item B<-h>, B<--help>

Print a brief help message and exit.

=item B<-o>, B<--old>

Be more compatible with old RHL/FC releases.  With this option enabled,
the generated spec file

=over 4

=item *

Defines perl_vendorlib or perl_vendorarch.

=item *

Includes explicit dependencies for core Perl modules.

=item *

Uses C<%check || :> instead of just C<%check>.

=item *

Includes a hack to remove LD_RUN_PATH from Makefile.

=back

=item B<-P>, B<--perl-version>

Include explicit dependencies for core modules when newer versions are
required than shipped with the specified version.

=item B<-l>, B<--license>

Generate COPYING and Artistic license texts if the source doesn't seem
to include them.

=item B<-n>, B<--noprefix>

Don't add I<perl-> prefix to the name of the package.  This is useful
for perl-based applications (such as this one), so that the name of
the rpm is simply B<cpanspec> instead of B<perl-cpanspec>.

=item B<-f>, B<--force>

Force overwriting an existing spec file.  Normally B<cpanspec> will
refuse to overwrite an existing spec file for safety.  This option
removes that safety check.  Please use with caution.

=item B<-S>, B<--stdout>

Write the generated spec file to stdout instead of a file.

=item B<-p>, B<--packager>

The name and email address of the packager.  Overrides the C<%packager>
macro in C<~/.rpmmacros>.

=item B<-r>, B<--release>

The release number of the package.  Defaults to 1.

=item B<-e>, B<--epoch>

The epoch number of the package.  By default, this is undefined, so
no epoch will be used in the generated spec.

=item B<-d>, B<--disttag>

Disttag (a string to append to the release number), used to
differentiate builds for various releases.  Defaults to the
semi-standard (for Fedora) string C<%{?dist}>.

=item B<-D>, B<--download-only>

Only download the upstream tarball, do not generate a specfile. Most
other options are ignored as they are only relevant when creating a
specfile or building a package.

=item B<-s>, B<--srpm>

Build a source rpm from the generated spec file.

=item B<-b>, B<--build>

Build source and binary rpms from the generated spec file.
B<Please be aware that this is likely to fail!>  Even if it succeeds,
the generated rpm will almost certainly need some work to make
rpmlint happy.

=item B<-c>, B<--cpan>

The URL to a CPAN mirror.  If not specified with this option or the
B<CPAN> environment variable, defaults to L<http://www.cpan.org/>.

=item B<-v>, B<--verbose>

Be more verbose.

=item B<-m>, B<--prefer-macros>

Prefer the macro form of common spec constructs over the environment variable
form (e.g. %{buildroot} vs $RPM_BUILD_ROOT).

=item B<--follow>

Add build dependencies to the list of modules to process.

=item B<--filter-requires>

Specify Requires to remove.

=item B<--filter-provides>

Specify Provides to remove.

=item B<--add-requires>

Add Requires for this item.

=item B<--add-provides>

Add Provides for this item.

=item B<--add-buildrequires>

Add BuildRequires for this item.

=item B<--version>

Print the version number and exit.

=back

=head1 AUTHOR

Steven Pritchard <steve@kspei.com>

=head1 SEE ALSO

L<perl(1)>, L<cpan2rpm(1)>, L<cpanflute2(1)>

=cut

use strict;
use warnings;

use FileHandle;
use Archive::Tar;
use Archive::Zip qw(:ERROR_CODES);
use POSIX;
use locale;
use Text::Autoformat;
use YAML qw(Load);
use Getopt::Long;
use Pod::Usage;
use File::Basename;
use LWP::UserAgent;
use Parse::CPAN::Packages;
use Pod::Simple::TextContent;
use Module::CoreList;
# Apparently gets pulled in by another module.
#use Cwd;

our %opt;

our $help=0;
our $compat=0;
our $perl_version=0;
our $addlicense=0;
our $noprefix=0;
our $force=0;
our $stdout=0;
our $packager;
our $release=1;
our $epoch;
our $disttag='%{?dist}';
our $download_only=(basename($0) eq "cpanget") ? 1 : 0;
our $buildsrpm=0;
our $buildrpm=0;
our $verbose=0;
our $follow=0;
our $macros=0;
our $source;
our $cpan=$ENV{'CPAN'} || "http://www.cpan.org";

our $home=$ENV{'HOME'} || (getpwuid($<))[7];
die "Can't locate home directory.  Please define \$HOME.\n"
    if (!defined($home));

our $pkgdetails="$home/.cpan/sources/modules/02packages.details.txt.gz";
our $updated=0;

our $packages;

our @filter_requires;
our @filter_provides;
our @add_requires;
our @add_provides;
our @add_buildrequires;

# env. vars and their macro analogues
my @MACROS = (

    # 0 is for the full expansions....
    {
        'optimize'  => '$RPM_OPT_FLAGS',
        'buildroot' => '$RPM_BUILD_ROOT',
    },

    # 1 is for the macros.
    {
        'optimize'  => '%{optflags}',
        'buildroot' => '%{buildroot}',
    },
);

# this is set after the parameters are passed
our %macro;

our %dep_blacklist = (
    'Win32' => 1,               # We're not on win32
    'Win32::Process' => 1,      # We're not on win32
    'Test::Perl::Critic' => 1,  # Too many dependencies
    'ok' => 1,                  # Side effect of Test::use::ok
    'BaseClass' => 1,           # Common test class shipped by ourselves
    'TestServer' => 1,          # Likewise
);

sub print_version {
    print "$NAME version $VERSION\n";
    exit 0;
}

sub verbose(@) {
    print STDERR @_, "\n" if ($verbose);
}

sub fetch($$) {
    my ($url, $file)=@_;
    my @locations=();

    verbose("Fetching $file from $url...");

    my $ua=LWP::UserAgent->new('env_proxy' => 1)
        or die "LWP::UserAgent->new() failed: $!\n";

    my $request;
    LOOP: $request=HTTP::Request->new('GET' => $url)
        or die "HTTP::Request->new() failed: $!\n";

    my @buf=stat($file);
    $request->if_modified_since($buf[9]) if (@buf);

    # FIXME - Probably should do $ua->request() here and skip loop detection.
    my $response=$ua->simple_request($request)
        or die "LWP::UserAgent->simple_request() failed: $!\n";

    push(@locations, $url);
    if ($response->code eq "301" or $response->code eq "302") {
        $url=$response->header('Location');
        die "Redirect loop detected! " . join("\n ", @locations, $url) . "\n"
            if (grep { $url eq $_ } @locations);
        goto LOOP;
    }

    if ($response->is_success) {
        my $fh=new FileHandle ">$file"
            or die "Can't write to $file: $!\n";
        print $fh $response->content;
        $fh->close();

        my $last_modified=$response->last_modified;
        utime(time, $last_modified, $file) if ($last_modified);
    } elsif ($response->code eq "304") {
        verbose("$file is up to date.");
    } else {
        die "Failed to get $url: " . $response->status_line . "\n";
    }
}

sub mkdir_p($) {
    my $dir=shift;

    my @path=split '/', $dir;

    for (my $n=0;$n<@path;$n++) {
        my $partial="/" . join("/", @path[0..$n]);
        if (!-d $partial) {
            verbose("mkdir($partial)");
            mkdir $partial or die "mkdir($partial) failed: $!\n";
        }
    }
}

sub update_packages() {
    return 1 if ($updated);

    verbose("Updating $pkgdetails...");

    mkdir_p(dirname($pkgdetails)) if (!-d dirname($pkgdetails));

    fetch("$cpan/modules/" . basename($pkgdetails), $pkgdetails);

    $updated=1;
}

sub build_rpm($) {
    my $spec=shift;
    my $dir=getcwd();

    my $rpmbuild=which("rpmbuild","rpm");

    verbose("Building " . ($buildrpm ? "rpms" : "source rpm") . " from $spec");

    # From Fedora CVS Makefile.common.
    if (system($rpmbuild, "--define", "_sourcedir $dir",
                          "--define", "_builddir $dir",
                          "--define", "_srcrpmdir $dir",
                          "--define", "_rpmdir $dir",
                          ($buildrpm ? "-ba" : ("-bs", "--nodeps")),
                          $spec) != 0) {
        if ($? == -1) {
            die "Failed to execute $rpmbuild: $!\n";
        } elsif (WIFSIGNALED($?)) {
            die "$rpmbuild died with signal " . WTERMSIG($?)
                . (($? & 128) ? ", core dumped\n" : "\n");
        } else {
            die "$rpmbuild exited with value " . WEXITSTATUS($?) . "\n";
        }
    }
}

sub list_files($$) {
    my $archive=$_[0];
    my $type=$_[1];

    if ($type eq 'tar') {
        return $archive->list_files();
    } elsif ($type eq 'zip') {
        return map { $_->fileName(); } $archive->members();
    }
}

sub extract($$$) {
    my $archive=$_[0];
    my $type=$_[1];
    my $filename=$_[2];

    if ($type eq 'tar') {
        return $archive->get_content($filename);
    } elsif ($type eq 'zip') {
        return $archive->contents($filename);
    }
}

sub get_description(%) {
    my %args=@_;
    my $pm="";
    my ($summary, $description);

    my $path=$args{module};
    $path=~s,::,/,g;
    my @pmfiles=("$args{path}/lib/$path.pod",
        "$args{path}/lib/$path.pm");
    if ($args{module} =~ /::/) {
        my @tmp=split '/', $path;
        my $last=pop @tmp;
        push(@pmfiles, "$args{path}/lib/$last.pod",
            "$args{path}/lib/$last.pm");
    }
    do {
        push(@pmfiles, "$args{path}/$path.pod",
            "$args{path}/$path.pm");
    } while ($path=~s,^[^/]+/,,);
    push(@pmfiles, "$args{path}/$args{module}")
        if ($args{module} !~ /::/);

    for my $file (@pmfiles) {
        $pm=(grep { $_ eq $file or $_ eq "./$file" }
            list_files($args{archive}, $args{type}))[0];
        last if $pm;
    }

    if ($pm) {
        verbose "Trying to fetch description from $pm...";

        if (my $content=extract($args{archive}, $args{type}, $pm)) {
            my $parser=Pod::Simple::TextContent->new()
                or die "Pod::Simple::TextContent->new() failed: $!\n";
            $parser->no_whining(1);
            my $rendered="";
            $parser->output_string(\$rendered);
            $parser->parse_string_document($content);
            if ($parser->content_seen and $rendered) {
                if ($rendered=~/DESCRIPTION\s+(\S.*?)\n\n/s) {
                    $description=$1;
                }
                if ($rendered=~/NAME\s*$args{module}\s[-\s]*(\S[^\n]*)/s) {
                    if ($1 ne "SYNOPSIS") {
                        $summary=$1;
                        $summary=~s/[.\s]+$//;
                        $summary=~s/^(?:An?|The)\s+//i;
                        $summary=ucfirst($summary);
                    }
                }
                return($description, $summary) if (defined($description));
            }
        } else {
            warn "Failed to read $pm from $args{filename}"
                . ($args{type} eq 'tar'
                    ? (": " . $args{archive}->error()) : "") . "\n";
        }
    }

    if (my $readme=(sort {
                        length($a) <=> length($b) or $a cmp $b
                     } (grep /README/i, @{$args{files}}))[0]) {
        verbose "Trying to fetch description from $readme...";

        if (my $content=extract($args{archive}, $args{type},
                "$args{path}/$readme")) {
            $content=~s/\r//g; # Why people use DOS text, I'll never understand.
            for my $string (split "\n\n", $content) {
                $string=~s/^\n+//;
                if ((my @tmp=split "\n", $string) > 2
                    and $string !~ /^[#\-=]/) {
                    return($string, undef);
                }
            }
        } else {
            warn "Failed to read $readme from $args{filename}"
                . ($args{type} eq 'tar'
                    ? (": " . $args{archive}->error()) : "") . "\n";
        }
    }

    return(undef, undef);
}

sub check_rpm($) {
    my $dep=shift;

    my $rpm=which("rpm");

    my @out=`$rpm -q --whatprovides "$dep"`;

    if ($? != 0) {
        #warn "backtick (rpm) failed with return value $?";
        return undef;
    }

    return @out;
}

sub check_repo($) {
    my $dep=shift;

    my ($repoquery, $repoqueryopts);
    if (-x ($repoquery = which('dnf'))) {
        $repoqueryopts = "whatprovides '${dep}'"
    } elsif (-x ($repoquery = which('repoquery'))) {
        $repoqueryopts = "--whatprovides '${dep}'"
    } else {
        return undef
    }

    verbose("Running $repoquery to check for $dep.  This may take a while...");
    my @out=`$repoquery $repoqueryopts 2>/dev/null`;

    if ($? != 0) {
        #warn "backtick (repoquery) failed with return value $?";
        return undef;
    }

    return grep { /^\S+-[^-]+-[^-]+$/ } @out;
}

sub check_dep($) {
    my $module=shift;

    return (check_rpm("perl($module)") || check_repo("perl($module)"));
}

sub which(@) {
    for my $bin (@_) {
        for my $path (split /:/, $ENV{PATH}) {
            return "$path/$bin" if -x "$path/$bin";
        }
    }
    die("Cannot find " . join(" or ", @_));
}

# Set locale to en_US.UTF8 so that dates in changelog will be correct
# if using another locale. Also ensures writing out UTF8. (Thanks to
# Roy-Magne Mo for pointing out the problem and providing a solution.)
setlocale(LC_ALL, "en_US.UTF-8");

GetOptions(
        'help|h'            => \$help,
        'old|o'             => \$compat,
        'perl-version|P=s'  => \$perl_version,
        'license|l'         => \$addlicense,
        'noprefix|n'        => \$noprefix,
        'force|f'           => \$force,
        'stdout|S'          => \$stdout,
        'packager|p=s'      => \$packager,
        'release|r=i'       => \$release,
        'epoch|e=i'         => \$epoch,
        'disttag|d=s'       => \$disttag,
        'download-only|D'   => \$download_only,
        'srpm|s'            => \$buildsrpm,
        'build|b'           => \$buildrpm,
        'cpan|c=s'          => \$cpan,
        'verbose|v'         => \$verbose,
        'follow'            => \$follow,
        'filter-requires=s' => \@filter_requires,
        'filter-provides=s' => \@filter_provides,
        'add-requires=s'    => \@add_requires,
        'add-provides=s'    => \@add_provides,
        'add-buildrequires=s' => \@add_buildrequires,
        'version'           => \&print_version,
        'prefer-macros|m'   => \$macros,
    ) or pod2usage({ -exitval => 1, -verbose => 0 });

pod2usage({ -exitval => 0, -verbose => 1 }) if ($help);
pod2usage({ -exitval => 1, -verbose => 0 }) if (!@ARGV);

if ($follow and $buildrpm) {
    warn "Sorry, --follow and --build are mutually exclusive right now.\n"
        . "We can't build when tracking deps right now.  Ignoring --build.\n";
    $buildrpm=0;
}

%macro = %{ $MACROS[$macros] };

my $prefix=$noprefix ? "" : "perl-";

my $rpm=which("rpm");
$packager=$packager || `$rpm --eval '\%packager'`;

chomp $packager;

if (!$packager or $packager eq "\%packager") {
    die "\%packager not defined in ~/.rpmmacros."
        . "  Please add or use --packager option.\n";
}

our %corelist;

if($perl_version) {
    die("Unknown perl version: $perl_version. (Known versions: " . join(", ", keys %Module::CoreList::version) . ")")
        unless exists $Module::CoreList::version{$perl_version};
    %corelist = %{ $Module::CoreList::version{$perl_version} };
}
else {
    my $rpm=new FileHandle "rpm -q --provides perl|"
        or warn "Failed to execute rpm: $!\n";

    while (my $provides=<$rpm>) {
        chomp $provides;

        if ($provides=~/^perl\(([^\)]+)\)(?:\s+=\s+(\S+))\s*$/) {
            $corelist{$1}=defined($2) ? $2 : 0;
        }
    }
}

my @args=@ARGV;
my @processed=();

update_packages();
$packages=Parse::CPAN::Packages->new($pkgdetails)
    if (!defined($packages));
die "Parse::CPAN::Packages->new() failed: $!\n"
    if (!defined($packages));

for my $file (@args) {
    my ($name,$version,$type);

    if ($file =~ /^(?:.*\/)?(.*)-(?:v\.?)?([^-]+)\.(tar)\.(?:gz|bz2)$/) {
        $name=$1;
        $version=$2;
        $type=$3;
    } elsif ($file =~ /^(?:.*\/)?(.*)-(?:v\.?)?([^-]+)\.tgz$/) {
        $name=$1;
        $version=$2;
        $type = 'tar';
    } elsif ($file =~ /^(?:.*\/)?(.*)-(?:v\.?)?([^-]+)\.(zip)$/) {
        $name=$1;
        $version=$2;
        $type=$3;
    } else {
        
        # keep things happy if we get "Foo-Bar" instead of "Foo::Bar"
        $file =~ s/-/::/g;

        # Look up $file in 02packages.details.txt.
        my ($m,$d);
        if ($m=$packages->package($file) and $d=$m->distribution()) {
            $source=$cpan . "/authors/id/" . $d->prefix();
            $file=basename($d->filename());
            fetch($source, $file);
            next if $download_only;
            $name=$d->dist();
            $version=$d->version();
            $version=~s/^v\.?//;
            if ($file =~ /\.(tar)\.gz$/) {
                $type=$1;
            } elsif ($file =~ /\.tgz$/) {
                $type='tar';
            } elsif ($file =~ /\.(zip)$/) {
                $type=$1;
            } else {
                warn "Failed to parse '$file', skipping...\n";
                next;
            }
        } else {
            warn "Failed to parse '$file' or find a module by that name, skipping...\n";
            next;
        }
    }

    my $module=$name;
    $module=~s/-/::/g;

    my $archive;
    my $path;
    if ($type eq 'tar') {
        my $f=$file;
        if ($file=~/\.bz2$/) {
            eval {
                use IO::Uncompress::Bunzip2;
            };

            if ($@) {
                warn "Failed to load IO::Uncompress::Bunzip2: $@\n";
                warn "Skipping $file...\n";
                next;
            }

            $f=IO::Uncompress::Bunzip2->new($file);
            if (!defined($f)) {
                warn "IO::Uncompress::Bunzip2->new() failed on $file: $!\n";
                next;
            }
        }
        $archive=Archive::Tar->new($f, 1)
            or die "Archive::Tar->new() failed: $!\n";
    } elsif ($type eq 'zip') {
        $archive=Archive::Zip->new() or die "Archive::Zip->new() failed: $!\n";
        die "Read error on $file\n" unless ($archive->read($file) == AZ_OK);
    }

    my @files;
    
    my $bogus=0;
    for my $entry (list_files($archive, $type)) {
        next if ($type eq 'tar' and $entry eq 'pax_global_header');

        if ($entry !~ /^(?:.\/)?($name(?:-(?:v\.?)?$version)?)(?:\/|$)/) {
            warn "BOGUS PATH DETECTED: $entry\n";
            $bogus++;
            next;
        } elsif (!defined($path)) {
            $path=$1;
        }

        $entry =~ s,^(?:.\/)?$name(?:-(?:v\.?)?$version)?/,,;
        next if (!$entry);

        push(@files, $entry);
    }
    if ($bogus) {
        warn "Skipping $file with $bogus path elements!\n";
        next;
    }

    my $url="https://metacpan.org/release/$name/";

    $source=$source || "http://www.cpan.org/modules/by-module/"
        . ($module=~/::/ ? (split "::", $module)[0] : (split "-", $name)[0])
        . "/" . basename($file);
    $source=~s/$version/\%{version}/;

    my ($description,$summary)=get_description(
            archive     => $archive,
            type        => $type,
            filename    => $file,
            name        => $name,
            module      => $module,
            version     => $version,
            files       => \@files,
            path        => $path,
        );

    if (defined($description) and $description) {
        $description=autoformat $description, { "all"     => 1,
                                                "left"    => 1,
                                                "right"   => 75,
                                                "squeeze" => 0,
                                              };
        $description=~s/\n+$//s;
    } else {
        $description="$module Perl module";
    }

    $summary="$module Perl module" if (!defined($summary));

    my @doc=sort { $a cmp $b } grep {
                !/\//
            and !/\.(pl|xs|h|c|pm|ini?|pod|cfg|inl)$/i
            and !/^\./
            and $_ ne $path
            and $_ ne "MANIFEST"
            and $_ ne "MANIFEST.SKIP"
            and $_ ne "INSTALL"
            and $_ ne "SIGNATURE"
            and !/^META\..+$/i
            and $_ ne "NINJA"
            and $_ ne "configure"
            and $_ ne "config.guess"
            and $_ ne "config.sub"
            and $_ ne "typemap"
            and $_ ne "bin"
            and $_ ne "lib"
            and $_ ne "t"
            and $_ ne "inc"
            and $_ ne "autobuild.sh"
            and $_ ne "pm_to_blib"
            and $_ ne "install.sh"
            } @files;

    my $date=strftime("%a %b %d %Y", localtime);

    my $noarch=!grep /\.(c|h|xs|inl)$/i, @files;
    my $vendorlib=($noarch ? "vendorlib" : "vendorarch");
    my $lib="\%{perl_$vendorlib}";

    if (@filter_requires) {
        my $script="$name-filter-requires.sh";
        verbose "Writing $script...";
        my $sh;
        if ($force) {
            rename($script, "$script~") if (-e $script);
            $sh=new FileHandle ">$script";
        } else {
            $sh=new FileHandle $script, O_WRONLY|O_CREAT|O_EXCL;
        }
        die "Failed to create $script: $!\n" if (!$sh);

        map { s/\//\\\//g } @filter_requires;
        print $sh "#!/bin/sh\n\n"
            . "\@\@PERL_REQ\@\@ \"\$\@\" | sed -e '/^$filter_requires[0]\$/d'";
        if (@filter_requires > 1) {
            for my $dep (@filter_requires[1..$#filter_requires]) {
                print $sh " \\\n    -e '/^$dep\$/d'";
            }
        }
        print $sh "\n";
    }

    if (@filter_provides) {
        my $script="$name-filter-provides.sh";
        verbose "Writing $script...";
        my $sh;
        if ($force) {
            rename($script, "$script~") if (-e $script);
            $sh=new FileHandle ">$script";
        } else {
            $sh=new FileHandle $script, O_WRONLY|O_CREAT|O_EXCL;
        }
        die "Failed to create $script: $!\n" if (!$sh);

        map { s/\//\\\//g } @filter_provides;
        print $sh "#!/bin/sh\n\n"
            . "\@\@PERL_PROV\@\@ \"\$\@\" | sed -e '/^$filter_provides[0]\$/d'";
        if (@filter_provides > 1) {
            for my $dep (@filter_provides[1..$#filter_provides]) {
                print $sh " \\\n    -e '/^$dep\$/d'";
            }
        }
        print $sh "\n";
    }

    my $specfile="$prefix$name.spec";
    verbose "Writing $specfile...";

    my $spec;
    if ($stdout) {
        $spec = *STDOUT;
    } elsif ($force) {
        rename($specfile, "$specfile~") if (-e $specfile);
        $spec=new FileHandle ">$specfile";
    } else {
        $spec=new FileHandle "$specfile", O_WRONLY|O_CREAT|O_EXCL;
    }

    if (!$spec) {
        warn "Failed to create $specfile: $!\n";
        next;
    }

    print $spec qq[\%{!?perl_$vendorlib: \%define perl_$vendorlib \%(eval "\`\%{__perl} -V:install$vendorlib\`"; echo \$install$vendorlib)}\n\n]
        if ($compat);

    my $license="";

    # TODO It's possible these need to be listed instead of just detected.
    my $uses_autoinstall = grep /Module\/AutoInstall.pm/, @files;
    my $scripts=0;
    my $makecontent;
    if (grep /^Makefile\.PL$/, @files
        and $makecontent=extract($archive, $type, "$path/Makefile.PL")) {
        $scripts ||= $makecontent =~ 'install_script';
        $scripts ||= ($makecontent =~ /EXE_FILES/ && $makecontent !~ /EXE_FILES.*\[\s*(qw\(\s*\)\s*)?\]/) ? 1 : 0;
    }
    if (grep /^Build\.PL$/, @files
        and $makecontent=extract($archive, $type, "$path/Build.PL")) {
        $scripts ||= $makecontent =~ 'script_files';
    }
    my (%build_requires,%requires);
    my ($yml,$meta);
    if (grep /^META\.yml$/, @files
        and $yml=extract($archive, $type, "$path/META.yml")) {
        # Basic idea borrowed from Module::Depends.
        my $meta;
        eval { $meta=Load($yml); };
        if ($@) {
            warn "Error parsing $path/META.yml: $@";
            goto SKIP;
        }

        %build_requires=%{$meta->{build_requires}} if ($meta->{build_requires});
        %build_requires=(%build_requires, %{$meta->{configure_requires}}) if ($meta->{configure_requires});
        %requires=%{$meta->{requires}} if ($meta->{requires});
        if ($meta->{recommends}) {
            for my $dep (keys(%{$meta->{recommends}})) {
                $requires{$dep}=$requires{$dep}
                    || $meta->{recommends}->{$dep};
            }
        }

        # FIXME - I'm not sure this is sufficient...
        if ($meta->{script_files} or $meta->{scripts}) {
            $scripts=1;
        }

        if ($meta->{license}) {
            # This list of licenses is from the Module::Build::API
            # docs, cross referenced with the list of licenses in
            # /usr/share/rpmlint/config.
            if ($meta->{license} =~ /^perl$/i) {
                $license="GPL+ or Artistic";
            } elsif ($meta->{license} =~ /^apache$/i) {
                $license="Apache Software License";
            } elsif ($meta->{license} =~ /^artistic$/i) {
                $license="Artistic";
            } elsif ($meta->{license} =~ /^artistic_?2$/i) {
                $license="Artistic 2.0";
            } elsif ($meta->{license} =~ /^bsd$/i) {
                $license="BSD";
            } elsif ($meta->{license} =~ /^gpl$/i) {
                $license="GPL+";
            } elsif ($meta->{license} =~ /^lgpl$/i) {
                $license="LGPLv2+";
            } elsif ($meta->{license} =~ /^mit$/i) {
                $license="MIT";
            } elsif ($meta->{license} =~ /^mozilla$/i) {
                $license="MPL";
            } elsif ($meta->{license} =~ /^cc0$/i) {
                $license="CC0";
            } elsif ($meta->{license} =~ /^open_source$/i) {
                $license="OSI-Approved"; # rpmlint will complain
            } elsif ($meta->{license} =~ /^unrestricted$/i) {
                $license="Distributable";
            } elsif ($meta->{license} =~ /^restrictive$/i) {
                $license="Non-distributable";
                warn "License is 'restrictive'."
                    . "  This package should not be redistributed.\n";
            } else {
                warn "Unknown license '" . $meta->{license} . "'!\n";
                $license="CHECK(Distributable)";
            }
        }
        SKIP:
    }

    if (my @licenses=grep /license|copyright|copying/i, @doc) {
        if (!$license) {
            $license="Distributable, see @licenses";
        } elsif ($license=~/^(OSI-Approved|Distributable|Non-distributable)$/) {
            $license.=", see @licenses";
        }
    }
    $license="CHECK(GPL+ or Artistic)" if (!$license);

    # Add build dependencies for modules used in tests.
    my @tests=grep {
                  $_ eq "test.pl"
                  or $_ =~ /^t\/.*\.t$/
              } @files;
    use Module::ExtractUse;
    my %bogus_dep=();
    for my $testfile (@tests) {
        my $extract_o_matic=Module::ExtractUse->new()
            or die "Module::ExtractUse->new failed: $!\n";
        my $test=extract($archive, $type, $path . '/' . $testfile);
        if (!defined($test)) {
            warn "Failed to extract $testfile from $archive: $!\n";
            next;
        }
        $extract_o_matic->extract_use(\$test);
        for my $dep ($extract_o_matic->array()) {
            next if ($dep eq $module);
            next if exists $build_requires{$dep};
            next if exists $bogus_dep{$dep};
            my $package = $packages->package($dep);
            if (!defined($package)) {
                $bogus_dep{$dep}++;
                # Don't print this for common false positives
                unless ($dep =~ /^(Config|base|5|lib)/) {
                    verbose("Module not on CPAN, not adding dependency: $dep");
                }
                next;
            }
            if ($package->distribution->dist eq $name) {
                #verbose("Dependency $dep provided by ourselves, not adding dependency");
                next;
            }
            $build_requires{$dep} ||= 0;
        }
    }

    my $usebuildpl=0;
    if (grep /^Build\.PL$/, @files) {
        $build_requires{'Module::Build'} ||= 0;
        $usebuildpl=1;
    } else {
        $build_requires{'ExtUtils::MakeMaker'} ||= 0;
    }

    if (!$usebuildpl) {
        # This is an ugly hack to parse any PREREQ_PM in Makefile.PL.
        if (open(CHILD, "-|") == 0) {
            eval {
                use subs 'WriteMakefile';

                sub WriteMakefile(@) {
                    my %args=@_;

                    if (!defined($args{'PREREQ_PM'})) {
                        return;
                    }

                    # Versioned BuildRequires aren't reliably honored by
                    # rpmbuild, but we'll include them anyway as a hint to the
                    # packager.
                    for my $dep (keys(%{$args{'PREREQ_PM'}})) {
                        print "BuildRequires: $dep";
                        print " " . $args{'PREREQ_PM'}->{$dep}
                            if ($args{'PREREQ_PM'}->{$dep});
                        print "\n";
                    }
                }
            };

            local $/=undef;

            my $makefilepl=extract($archive, $type, "$path/Makefile.PL")
                or warn "Failed to extract $path/Makefile.PL";

            open(STDIN, ">/dev/null");
            open(STDERR, ">/dev/null");
            eval "no warnings;
                  use subs qw(require die warn eval open close rename);
                  BEGIN { sub require { 1; } }
                  BEGIN { sub die { 1; } }
                  BEGIN { sub warn { 1; } }
                  BEGIN { sub eval { 1; } }
                  BEGIN { sub open { 1; } }
                  BEGIN { sub close { 1; } }
                  BEGIN { sub rename { 1; } }
                  $makefilepl";

            exit 0;
        } else {
            while (<CHILD>) {
                if (/^BuildRequires:\s*(\S+)\s*(\S+)?/) {
                    my $dep=$1;
                    my $version=0;
                    $version=$2 if (defined($2));
                    $build_requires{$dep}=$version;
                }
            }
        }
    }

    print $spec <<END;
Name:           $prefix$name
Version:        $version
Release:        $release$disttag
END

    print $spec "Epoch:          $epoch\n" if (defined($epoch));

    print $spec <<END;
Summary:        $summary
License:        $license
Group:          Development/Libraries
URL:            $url
Source0:        $source
BuildRoot:      \%{_tmppath}/\%{name}-\%{version}-\%{release}-root-\%(\%{__id_u} -n)
END

    printf $spec "%-16s%s\n", "BuildArch:", "noarch" if ($noarch);

    if (defined($requires{perl})) {
        $build_requires{perl}=$build_requires{perl} || $requires{perl};
        delete $requires{perl};
    }

    if (defined($build_requires{perl})) {
        $build_requires{perl} =~ s/^[<>=]+ *//;
        printf $spec "%-16s%s >= %s\n", "BuildRequires:", "perl",
            (($build_requires{perl} lt "5.6.0" ? "0:" : "1:")
            . $build_requires{perl}) if $build_requires{perl};
        delete $build_requires{perl};
    }

    for my $dep (keys(%requires)) {
        $build_requires{$dep}=$build_requires{$dep} || $requires{$dep};
    }

    for my $dep (sort(keys(%build_requires))) {
        next if exists $dep_blacklist{$dep};
        if (exists($corelist{$dep}) && $corelist{$dep} ge $build_requires{$dep}) {
            next if (!$compat);
        } elsif ($follow) {
            if ($dep ne $module and !(grep { $_ eq $dep } @processed, @args)) {
                if (check_dep($dep)) {
                    verbose("$dep is available, skipping.");
                } else {
                    verbose("$dep is not available, adding it to the list.");
                    push(@args, $dep);
                }
            }
        }
        printf $spec "%-16s%s", "BuildRequires:", "perl($dep)";
        print $spec (" >= " . $build_requires{$dep})
            if ($build_requires{$dep});
        print $spec "\n";
    }

    for my $dep (@add_buildrequires) {
        printf $spec "%-16s%s\n", "BuildRequires:", $dep;
    }

    for my $dep (sort(keys(%requires))) {
        next if (!$compat and exists($corelist{$dep}));
        printf $spec "%-16s%s", "Requires:", "perl($dep)";
        print $spec (" >= " . $requires{$dep}) if ($requires{$dep});
        print $spec "\n";
    }

    for my $dep (@add_requires) {
        printf $spec "%-16s%s\n", "Requires:", $dep;
    }

    if (!$compat) {
        print $spec <<END;
Requires:       perl(:MODULE_COMPAT_\%(eval "`\%{__perl} -V:version`"; echo \$version))
END
    }

    for my $prov (@add_provides) {
        printf $spec "%-16s%s\n", "Provides:", $prov;
    }

    if (@filter_requires) {
        print $spec <<END

Source98:       $name-filter-requires.sh
\%global real_perl_requires \%{__perl_requires}
\%define __perl_requires \%{_tmppath}/\%{name}-\%{version}-\%{release}-\%(\%{__id_u} -n)-filter-requires
END
    }

    if (@filter_provides) {
        print $spec <<END

Source99:       $name-filter-provides.sh
\%global real_perl_provides \%{__perl_provides}
\%define __perl_provides \%{_tmppath}/\%{name}-\%{version}-\%{release}-\%(\%{__id_u} -n)-filter-provides
END
    }

    my $buildpath=$path;
    $buildpath=~s/$version/\%{version}/;
    print $spec <<END;

\%description
$description

\%prep
\%setup -q@{[($noprefix ? "" : " -n $buildpath")]}
END

    if (@filter_requires) {
        print $spec <<'END';

sed -e 's,@@PERL_REQ@@,%{real_perl_requires},' %{SOURCE98} > %{__perl_requires}
chmod +x %{__perl_requires}
END
    }

    if (@filter_provides) {
        print $spec <<'END';

sed -e 's,@@PERL_PROV@@,%{real_perl_provides},' %{SOURCE99} > %{__perl_provides}
chmod +x %{__perl_provides}
END
    }

    if (grep { $_ eq "pm_to_blib" } @files) {
        print $spec <<'END';

rm -f pm_to_blib
END
    }

    print $spec <<END;

\%build
END

    if($uses_autoinstall) {
        print $spec <<END
export PERL_AUTOINSTALL="--skipdeps"
END
    }

    if ($usebuildpl) {
        print $spec <<END;
\%{__perl} Build.PL --installdirs=vendor@{[$noarch ? '' : qq{ --optimize="$macro{optimize}"} ]}
./Build
END
    } else {
        print $spec <<END;
\%{__perl} Makefile.PL INSTALLDIRS=vendor@{[$noarch ? '' : qq{ OPTIMIZE="$macro{optimize}"}]}
END

        print $spec
            "\%{__perl} -pi -e 's/^\\tLD_RUN_PATH=[^\\s]+\\s*/\\t/' Makefile\n"
            if ($compat and !$noarch);

        print $spec <<END;
make \%{?_smp_mflags}
END
    }

    print $spec <<END;

\%install
rm -rf $macro{buildroot}

END

    if ($usebuildpl) {
        print $spec
            "./Build install --destdir=$macro{buildroot} --create_packlist=0\n";
    } else {
        print $spec <<END;
make pure_install PERL_INSTALL_ROOT=$macro{buildroot}

find $macro{buildroot} -type f -name .packlist -exec rm -f {} \\;
END
    }

    if (!$noarch) {
        print $spec <<END;
find $macro{buildroot} -type f -name '*.bs' -size 0 -exec rm -f {} \\;
END
}

    print $spec <<END;
find $macro{buildroot} -depth -type d -exec rmdir {} 2>/dev/null \\;

\%{_fixperms} $macro{buildroot}/*

END

    if ($addlicense and !grep /copying|artistic|copyright|license/i, @doc) {
        print $spec <<END;
perldoc -t perlgpl > COPYING
perldoc -t perlartistic > Artistic

END

        push(@doc, "COPYING", "Artistic");
    }

    print $spec <<END;
\%check@{[($compat ? ' || :' : '')]}
END
    if ($usebuildpl) {
        print $spec "./Build test\n";
    } else {
        print $spec "make test\n";
    }

    print $spec <<END;

\%clean
rm -rf $macro{buildroot}@{[
    (@filter_requires ? ' %{__perl_requires}' : '') .
    (@filter_provides ? ' %{__perl_provides}' : '')]}

\%files
\%defattr(-,root,root,-)
\%doc @doc
END

    if ($scripts) {
        print $spec "\%{_bindir}/*\n";
        print $spec "\%{_mandir}/man1/*\n";
    }

    if ($noarch) {
        print $spec "$lib/*\n";
    } else {
        print $spec "$lib/auto/*\n$lib/" . (split /::/, $module)[0] . "*\n";
    }

    print $spec <<END;
\%{_mandir}/man3/*

\%changelog
* $date $packager $version-$release
- Specfile autogenerated by $NAME $VERSION.
END

    $spec->close();

    build_rpm($specfile) if ($buildsrpm or $buildrpm);

    push(@processed, $module);
}

# vi: set ai et: